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1. 发明授权

US5729372A Optical transmission method and apparatus and optical amplification method and apparatus for optical communication system 失效
公开(公告)号：US5729372A
公开(公告)日：1998-03-17
申请号：US712958
申请日：1996-09-12
申请人： Takafumi Terahara , Terumi Chikama , Masuo Suyama , Takao Naito
发明人： Takafumi Terahara , Terumi Chikama , Masuo Suyama , Takao Naito
IPC分类号： G02F1/35 , H01S3/10 , H04B1/16 , H04B10/2507 , H04B10/2563 , H04B10/29 , H04B10/291 , H04B10/516 , H04B10/61 , H04B10/04
CPC分类号： H04B10/2572 , H04B10/291 , H04B10/2912 , H04B10/2918 , H04B10/2939 , H04B1/163
摘要： The invention provides an optical transmission method and apparatus suitable for use with a terminal station apparatus for an optical communication system for a very long distance of up to several thousands kilometers across an ocean as well as an optical amplification method and apparatus suitable for use with a repeater for an optical communication system. The methods and apparatus are improved in that the excessive loss in an optical amplifier and the variation of the branching ratio are suppressed to suppress the variation of the gain to suppress the polarization dependency of the loss or the gain on a transmission line of the optical communication system. The optical transmission apparatus comprises a depolarized light source for outputting depolarized light, and an external modulator for modulating light from the depolarized light source.

2. 发明授权

US5539566A Optical transmission method and apparatus and optical amplification method and apparatus for optical communication system 失效
标题翻译：光通信系统的光传输方法及装置及光放大方法及装置
公开(公告)号：US5539566A
公开(公告)日：1996-07-23
申请号：US425974
申请日：1995-04-20
申请人： Takafumi Terahara , Terumi Chikama , Masuo Suyama , Takao Naito
发明人： Takafumi Terahara , Terumi Chikama , Masuo Suyama , Takao Naito
IPC分类号： G02F1/35 , H01S3/10 , H04B1/16 , H04B10/2507 , H04B10/2563 , H04B10/29 , H04B10/291 , H04B10/516 , H04B10/61 , H04B10/17 , H04B10/04
CPC分类号： H04B10/2572 , H04B10/291 , H04B10/2912 , H04B10/2918 , H04B10/2939 , H04B1/163
摘要： The invention provides an optical transmission method and apparatus suitable for use with a terminal station apparatus for an optical communication system for a very long distance of up to several thousands kilometers across an ocean as well as an optical amplification method and apparatus suitable for use with a repeater for an optical communication system. The methods and apparatus are improved in that the excessive loss in an optical amplifier and the variation of the branching ratio are suppressed to suppress the variation of the gain to suppress the polarization dependency of the loss or the gain on a transmission line of the optical communication system. The optical transmission apparatus comprises a depolarized light source for outputting depolarized light, and an external modulator for modulating light from the depolarized light source.
摘要翻译：本发明提供一种光传输方法和装置，适用于通过海洋长达几千公里的远距离通信的光通信系统的终端装置，以及适于与中继器用于光通信系统。该方法和装置的改进在于，抑制光放大器中的过度损耗和分支比的变化，以抑制增益的变化，以抑制光通信的传输线上的损耗或增益的极化依赖性系统。光传输装置包括用于输出去偏振光的去极化光源和用于调制来自去偏振光源的光的外部调制器。

3. 发明授权

US06807376B2 Gain equalizer which includes a plurality of optical filters for equalizing the gain of an optical amplifier 失效
标题翻译：增益均衡器，其包括用于均衡光放大器的增益的多个滤光器
公开(公告)号：US06807376B2
公开(公告)日：2004-10-19
申请号：US09960403
申请日：2001-09-24
申请人： Naomasa Shimojoh , Takafumi Terahara , Terumi Chikama
发明人： Naomasa Shimojoh , Takafumi Terahara , Terumi Chikama
IPC分类号： H04B1012
CPC分类号： H04B10/2941 , H01S3/10023 , H01S3/1312 , H01S2301/04 , H04B10/2942 , H04J14/0221
摘要： A gain equalizer which equalizes gain versus wavelength characteristics of an optical amplifier. The gain versus wavelength characteristics of the optical amplifier include first, second and third gain peaks in a wavelength band with the second gain peak being between the first and third gain peaks. The optical amplifier amplifies an input signal in accordance with the gain versus wavelength characteristics to produce an output signal. The gain equalizer includes first, second and third optical filters having first, second and third transparency characteristics, respectively. The first, second and third transparency characteristics are periodic waveforms having different periods related to the wavelength difference between the first and third gain peaks. The second transparency characteristic is a periodic waveform having a period equal to 1/(2n) of the period of the waveform of the first transparency characteristic. The third transparency characteristic is a periodic waveform having a period equal to ¼ of the period of the waveform of the first transparency characteristic. For example, the first transparency characteristic is a periodic waveform with ¼ period extending between the first and third gain peaks, the second transparency characteristic is a periodic waveform with one period extending between the first and third gain peaks, and the third transparency characteristic is a periodic waveform with two periods extending between the first and third gain peaks.
摘要翻译：增益均衡器，其均衡光放大器的增益对波长特性。光放大器的增益对波长特性包括波长带中的第一，第二和第三增益峰值，第二增益峰值在第一和第三增益峰值之间。光放大器根据增益对波长特性来放大输入信号以产生输出信号。增益均衡器包括分别具有第一，第二和第三透明特性的第一，第二和第三滤光器。第一，第二和第三透明度特征是具有与第一和第三增益峰值之间的波长差有关的不同周期的周期性波形。第二透明度特性是周期等于第一透明特性的波形周期的1 /（2 ）的周期波形。第三透明特性是周期等于第一透明特性的波形周期的1/4的周期波形。例如，第一透明特性是在第一和第三增益峰之间延伸的1/4周期的周期波形，第二透明特性是周期性波形，其中一个周期在第一和第三增益峰之间延伸，第三透明特性是具有在第一和第三增益峰之间延伸的两个周期的周期性波形。

4. 发明授权

US06647211B2 REMOTE CONTROL DEVICE OF ACOUSTO-OPTIC TUNABLE FILTER AND OPTICAL TRANSMISSION SYSTEM CONTAINING EQUALIZER USING ACOUSTO-OPTIC TUNABLE FILTER AND OPTICAL TRANSMISSION SYSTEM CONTAINING OPTICAL ADD/DROP MULTIPLEXER USING ACOUSTO-OPTIC TUNABLE FILTER 失效
标题翻译：使用ACOUSTO-OPTIC TUNABLE FILTER的光学透镜滤光器和包含光学传输系统的光学传输系统的远程控制设备和包含光学加/多路复用器的光传输系统使用ACOUSTO-OPTIC TUNABLE FILTER
公开(公告)号：US06647211B2
公开(公告)日：2003-11-11
申请号：US10067302
申请日：2002-02-07
申请人： Takafumi Terahara , Terumi Chikama
发明人： Takafumi Terahara , Terumi Chikama
IPC分类号： H04B1000
CPC分类号： H04J14/021 , H04B10/077 , H04B10/07955 , H04J14/02 , H04J14/0206 , H04J14/0212 , H04J14/0213
摘要： The invention provides a remote control device of an acousto-optic tunable filter, which comprises an acousto-optic tunable filter interpolated in an optical transmission line, capable of controlling an output state of an input light signal by being supplied with a surface acoustic wave control signal through a control port; a surface acoustic wave control signal source to generate the surface acoustic wave control signal, which is provided at a remote place from the acousto-optic tunable filter; and a control unit that receives an information of the surface acoustic wave control signal from the surface acoustic wave control signal source through remote transmission means, and supplies the surface acoustic wave control signal to the control port of the acousto-optic tunable filter. According to this invention, the scale of the device using the acousto-optic tunable filter becomes enlarged, the power consumption is increased; and the man power required for the maintenance of the devices can be reduced, and the remote control of the acousto-optic tunable filter can be achieved.
摘要翻译：本发明提供了一种声光可调谐滤波器的遥控装置，其包括在光传输线内插的声光可调谐滤波器，能够通过提供表面声波控制来控制输入光信号的输出状态信号通过控制端口; 表面声波控制信号源，用于产生声表面波控制信号，该声表面波控制信号设置在距离声光可调滤波器的远处; 以及控制单元，其通过远程发送装置从声表面波控制信号源接收声表面波控制信号的信息，并将声表面波控制信号提供给声光可调谐滤波器的控制端口。根据本发明，使用声光可调谐滤波器的装置的规模变大，功耗增加; 并且可以减少维护设备所需的人力，并且可以实现声光可调谐滤波器的远程控制。

5. 发明授权

US06344914B1 Gain equalizer which includes a plurality of optical filters for equalizing the gain of an optical amplifier 失效
标题翻译：增益均衡器，其包括用于均衡光放大器的增益的多个滤光器
公开(公告)号：US06344914B1
公开(公告)日：2002-02-05
申请号：US08805825
申请日：1997-02-26
申请人： Naomasa Shimojoh , Takafumi Terahara , Terumi Chikama
发明人： Naomasa Shimojoh , Takafumi Terahara , Terumi Chikama
IPC分类号： H04B1002
CPC分类号： H04B10/2941 , H01S3/10023 , H01S3/1312 , H01S2301/04 , H04B10/2942 , H04J14/0221
摘要： A gain equalizer which equalizes gain versus wavelength characteristics of an optical amplifier. The gain versus wavelength characteristics of the optical amplifier include first, second and third gain peaks in a wavelength band with the second gain peak being between the first and third gain peaks. The optical amplifier amplifies an input signal in accordance with the gain versus wavelength characteristics to produce an output signal. The gain equalizer includes first, second and third optical filters having first, second and third transparency characteristics, respectively. The first, second and third transparency characteristics are periodic waveforms having different periods related to the wavelength difference between the first and third gain peaks. The second transparency characteristic is a periodic waveform having a period equal to 1/(2n) of the period of the waveform of the first transparency characteristic. The third transparency characteristic is a periodic waveform having a period equal to ¼ of the period of the waveform of the first transparency characteristic. For example, the first transparency characteristic is a periodic waveform with ¼ period extending between the first and third gain peaks, the second transparency characteristic is a periodic waveform with one period extending between the first and third gain peaks, and the third transparency characteristic is a periodic waveform with two periods extending between the first and third gain peaks.
摘要翻译：增益均衡器，其均衡光放大器的增益对波长特性。光放大器的增益对波长特性包括波长带中的第一，第二和第三增益峰值，第二增益峰值在第一和第三增益峰值之间。光放大器根据增益对波长特性来放大输入信号以产生输出信号。增益均衡器包括分别具有第一，第二和第三透明特性的第一，第二和第三滤光器。第一，第二和第三透明度特征是具有与第一和第三增益峰值之间的波长差有关的不同周期的周期性波形。第二透明特性是周期等于第一透明特性的波形的周期的1 /（2n）的周期波形。第三透明特性是周期等于第一透明特性的波形周期的1/4的周期波形。例如，第一透明特性是在第一和第三增益峰之间延伸的1/4周期的周期波形，第二透明特性是周期性波形，其中一个周期在第一和第三增益峰之间延伸，第三透明特性是具有在第一和第三增益峰之间延伸的两个周期的周期性波形。

6. 发明授权

US06366379B1 REMOTE CONTROL DEVICE OF ACOUSTO-OPTIC TUNABLE FILTER AND OPTICAL TRANSMISSION SYSTEM CONTAINING EQUALIZER USING ACOUSTO-OPTIC TUNABLE FILTER AND OPTICAL TRANSMISSION SYSTEM CONTAINING OPTICAL ADD/DROP MULTIPLEXER USING ACOUSTO-OPTIC TUNABLE FILTER 失效
标题翻译：使用ACOUSTO-OPTIC TUNABLE FILTER的光学透镜滤光器和包含光学传输系统的光学传输系统的远程控制设备和包含光学加/多路复用器的光传输系统使用ACOUSTO-OPTIC TUNABLE FILTER
公开(公告)号：US06366379B1
公开(公告)日：2002-04-02
申请号：US09087497
申请日：1998-05-29
申请人： Takafumi Terahara , Terumi Chikama
发明人： Takafumi Terahara , Terumi Chikama
IPC分类号： H04B1000
CPC分类号： H04J14/021 , H04B10/077 , H04B10/07955 , H04J14/02 , H04J14/0206 , H04J14/0212 , H04J14/0213
摘要： A remote control device of an acousto-optic tunable filter includes an acousto-optic tunable filter, a surface acoustic wave control signal source and a control unit. The acousto-optic tunable filter receives an output light signals from an optical transmission line and has a control port to control and outputs state of the light signal received from the optical transmission line, based on a surface acoustic wave control signal received through the control port. The surface acoustic wave control signal source generates the surface acoustic wave control signal and is provided at a remote place from the acousto-optic tunable filter. The control unit receives information regarding the surface acoustic wave control signal generated by the surface acoustic wave control signal source and supplies the surface acoustic wave control signal to the control port of the acousto-optic tunable filter.
摘要翻译：声光可调谐滤波器的遥控装置包括声光可调谐滤波器，声表面波控制信号源和控制单元。声光可调谐滤波器接收来自光传输线的输出光信号，并且具有控制端口，用于基于通过控制端口接收的表面声波控制信号来控制和输出从光传输线接收的光信号的状态。表面声波控制信号源产生声表面波控制信号，并且设置在距离声光可调滤波器的远处。控制单元接收由声表面波控制信号源产生的表面声波控制信号的信息，并将声表面波控制信号提供给声光调节滤波器的控制端口。

7. 发明授权

US5253097A Demodulator and a polarization diversity receiver for coherent optical communication provided with the demodulator 失效
标题翻译：解调器和与解调器一起提供的相干光通信的偏振分集接收器
公开(公告)号：US5253097A
公开(公告)日：1993-10-12
申请号：US730002
申请日：1991-07-15
申请人： Takao Naito , Terumi Chikama , Shigeki Watanabe , Tetsuya Kiyonaga , Hiroshi Nakamoto , George Ishikawa
发明人： Takao Naito , Terumi Chikama , Shigeki Watanabe , Tetsuya Kiyonaga , Hiroshi Nakamoto , George Ishikawa
IPC分类号： H04B10/61 , H04B7/10 , H04B10/07 , H04B10/2507 , H04B10/516 , H04B10/556 , H04B10/564 , H04B10/572 , H04L27/227 , H04B10/06
CPC分类号： H04B10/61 , H04B10/614 , H04B10/64
摘要： A demodulator comprising an OR/NOR circuit, an exclusive OR/NOR circuit, and a delay circuit is disclosed as that capable of being suitably formed into a monolithic IC. Also, a polarization diversity receiver for coherent optical communication using the above demodulator as its constituent is disclosed as that having a smaller number of variable gain amplifiers and accordingly having the controlling circuit made simpler in structure.

8. 发明授权

US5228043A Direct modulation phase shift keying (DM-PSK) transmission system 失效
标题翻译：直接调制相移键控（DM-PSK）传输系统
公开(公告)号：US5228043A
公开(公告)日：1993-07-13
申请号：US730265
申请日：1991-07-15
申请人： Takao Naito , Terumi Chikama , Shigeki Watanabe , Hideo Kuwahara
发明人： Takao Naito , Terumi Chikama , Shigeki Watanabe , Hideo Kuwahara
IPC分类号： H04B10/516 , H04B10/07 , H04B10/2507 , H04B10/556 , H04B10/572 , H04B10/58 , H04B10/61 , H04L27/20 , H04L27/22 , H04L27/227
CPC分类号： H04L27/223 , H04B10/50 , H04B10/504 , H04B10/5561 , H04B10/60 , H04B10/64 , H04L27/2096
摘要： A direct modulation phase shift keying transmission system (DM-PSK transmission system) is disclosed for coherent optical fiber transmission in which an injection current supplied to a semiconductor laser is adapted to be directly modulated. This system presents useful features in automatic frequency control, demodulation, and phase noise suppression.

9. 发明授权

US5050176A Direct modulation phase-shift-keying system and method 失效
标题翻译：直接调制相移键控系统及方法
公开(公告)号：US5050176A
公开(公告)日：1991-09-17
申请号：US540284
申请日：1990-06-19
申请人： Takao Naito , Terumi Chikama , Shigeki Watanabe , Tetsuya Kiyonaga , Hiroshi Onaka , Yoshihito Onoda
发明人： Takao Naito , Terumi Chikama , Shigeki Watanabe , Tetsuya Kiyonaga , Hiroshi Onaka , Yoshihito Onoda
IPC分类号： H01S3/10 , H04B10/516 , H04B10/556 , H04B10/61 , H04L27/20 , H04L27/22 , H04L27/227 , H04L27/233
CPC分类号： H04L27/2331 , H04B10/50 , H04B10/504 , H04B10/5561 , H04B10/60 , H04B10/64 , H04L27/2096 , H04L27/223 , H04L27/2276
摘要： A direct modulation PSK system and method, in a coherent optical fiber transmission system, in which an injection current supplied to a laser diode is adapted to be directly varied is disclosed. In this system or method, a modulating current pulse is superposed on a bias current for the laser diode so that a specified phase condition may be satisfied. Thereby, a differential coding circuit and an external modulator being indispensable for a DPSK system become unnecessary and, in addition, the system becomes less susceptible to the influence of wavelength dispersion than the DPSK system and able to reproduce the carrier.

10. 发明授权

US06738181B1 Optical sending apparatus and channel extension method 失效
标题翻译：光发送装置和信道扩展方法
公开(公告)号：US06738181B1
公开(公告)日：2004-05-18
申请号：US09650856
申请日：2000-08-29
申请人： Hiroshi Nakamoto , Takao Naito , Terumi Chikama
发明人： Hiroshi Nakamoto , Takao Naito , Terumi Chikama
IPC分类号： H04B1012
CPC分类号： H04B10/2525 , G02B6/2713 , G02B6/276 , G02B6/29376 , H04B10/506 , H04B2210/254
摘要： An optical sending apparatus of this invention includes a plurality of optical signal generating sections, a dispersion compensating section and a wavelength multiplexing section. The dispersion compensating section performs compensation with a predetermined chromatic dispersion value to at least one of polarized light generated by the optical signal generating sections while a predetermined state of polarized light is maintained. The wavelength multiplexing section combines output light outputted from the optical signal generating section with output light passing through the dispersion compensating section so that the polarized light of adjacent wavelengths crosses orthogonal to each other. The optical sending apparatus having such a construction can generate high-density WDM optical signals, the dispersion of which is compensated in advance, by a polarization crossing method.
摘要翻译：本发明的光发送装置包括多个光信号产生部分，色散补偿部分和波长复用部分。色散补偿部在保持预定的偏振光状态的同时，对由光信号产生部产生的偏振光中的至少一个进行预定的色散值的补偿。波长复用部将从光信号生成部输出的输出光与通过色散补偿部的输出光组合，使得相邻波长的偏振光彼此正交交叉。具有这种结构的光发送装置可以通过偏振交叉方法产生高分散的WDM光信号，其偏差被预先补偿。

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